code: def test_heatmap_to_image_invalid():
      # heatmap must have rank 2 or rank 3
      with pytest.raises(ValueError):
          heatmap_to_image(np.zeros((1,)))
      # coloured heatmap must have 4 or 3 channels
      with pytest.raises(ValueError):
          heatmap_to_image(np.zeros((1, 1, 10)))
  
imports: import pytest
  import numpy
  from eli5.base import Explanation, TargetExplanation
  from eli5.formatters.image import format_as_image, heatmap_to_image, expand_heatmap, _validate_heatmap, _update_alpha, _cap_alpha, _overlay_heatmap
  from .utils_image import assert_pixel_by_pixel_equal
label_desc: Use image node_id 10 for calling a global function with example usage: test_heatmap_to_image_invalid() without return types